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Add a doFinalization method to the DataLayout pass.

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This pass is meant to be immutable, however it holds mutable state to cache StructLayouts.
This method will allow the pass manager to clear the mutable state between runs.

Note that unfortunately it is still necessary to have the destructor, even though it does the
same thing as doFinalization.  This is because most TargetMachines embed a DataLayout on which
doFinalization isn't run as its never added to the pass manager.

I also didn't think it was necessary to complication things with a deInit method for which
doFinalization and ~DataLayout both call as there's only one field of mutable state.  If we had
more fields to finalize i'd have added this.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@176877 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Pete Cooper
2013-03-12 17:37:31 +00:00
parent 4323665bd8
commit 8f8af529fc
2 changed files with 10 additions and 0 deletions
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6
lib/IR/DataLayout.cpp
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@@ -438,6 +438,12 @@ DataLayout::~DataLayout() {
delete static_cast<StructLayoutMap*>(LayoutMap);
}
bool DataLayout::doFinalization(Module &M) {
delete static_cast<StructLayoutMap*>(LayoutMap);
LayoutMap = 0;
return false;
}
const StructLayout *DataLayout::getStructLayout(StructType *Ty) const {
if (!LayoutMap)
LayoutMap = new StructLayoutMap();